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Things like "Elastic Ti", are almost certainly Titanium-Nickel alloy (aka "Nitinol"), selected for its superelasticity. Titanium mesh is also used on its own sometimes, where it adds weight and strength to specific areas (usually at the 3 and 9 o'clock positions, where the extra weight improves stability). With their "triple threat" rackets, Prince started using much heavier materials such as Tungsten to add even more weight (Yonex copied this idea in their Voltric series).

As far as all the nano-technology goes, it's anyone's guess. It's basically like when you buy a shampoo containing royal jelly, jojoba oil, citrus extracts etc - they probably make up about 1% of what goes into the racket, have no discernible effect whatsoever (maybe a slight placebo effect), and are really only there for marketing purposes.

according to yonex its just one of their titanium alloys. exact composition? no one knows, but they probably had experimented with different alloys to decide which was preferable in their design

SONIC METAL
SONIC METAL is a very strong, flexible and light weight new titanium alloy utilized by Yonex at the top of the frame. This yields high repulsion power, especially in an offense. Furthermore, it generates a clear hitting sound.

...
But sound is vibration, so I'm not entirely clear on how that would be 'quite a feature'...

Hehe, got me there. I meant like a sort of dampening feature ... focus the vibration/excess(?) kinetic energy in the rest of the racket towards that area instead of to your handle and your body. I am not talking about the actual workings of Yonex Sonic Metal but a fantasy feature that may or may not even be possible irl.
As for the actual stuff in rackets there has already been a thread in the previous year which should still be around in which the op could have continued (which is why I am rambling on fantasy feature as this is yet another duplicate thread )